Yahoo has confirmed that state-sponsored hackers stole information from approximately 500 million users, making it the largest publicly disclosed cyber breach in history. Details are continuing to emerge about the attack, but here's what you should know if you are a Yahoo account holder.

The company said the attack occurred in 2014. Some personal information such as names, phone numbers, dates of birth and unencrypted security questions and answers were stolen. They have stated, however, that credit card information was not taken.

The company's European headquarters is based here in Ireland and our Data Protection Commissioner has confirmed it had been notified of the breach.

What to do if you're a Yahoo account holder:

Change your password: While this hack took place in 2014, it's important that all users take the time to update their security information. Think up something more difficult than just "password123". It's advised that users never use the same password on more than one platform.

Two-factor authentication: Yahoo is recommending people turn on its two-factor authentication tool: Yahoo Account Key. It even eliminates the need to memorise a password

Not just mail: Yahoo is bigger than Yahoo. It's important to remember that Tumblr and Flickr accounts may have also been compromised. These passwords also need to be changed.